Data terminal controller



FIG. 1 is a front, top and right side perspective view of a data terminal controller, showing our new design;

FIG. 2 is a rear, top and left side perspective thereof;

FIGS. 3 through 8 are respectively, front, back, right, left, top and bottom orthographic views thereof on an enlarged scale. 

The ornamental design for a data terminal controller, as shown and described. 